Rotary razor-blade strop



July l, 1930. Jqs. CRAIB 1,768,573

ROTARY RAZOR BLADE sTRoP Filgd Dele. 1e, 1927 40 ication of the blade support. centre pin. The result of this is that when Pateated July 1,1930 1 l 1,768,573

UNiTED STATES PATENT oFEicE JAMES STEWART CRAIIB, OF VERDUN, QUEBEC, CANADA ROTARY RAZORJBLAD lSTROIE v Application led December 16, 1927, Serial No. 240,576, and in Great ,Britain August 2, 1927.

The invention relates to a rotary razor back and a short inclined wall 16 from the blade strop, as described in the present specifront end of the lug. cation and illustrated in the accompanying The front ends of the lug form the pivot 5 drawings that form part of the same. bearings 17, while the rear ends of the lug 55 The invention consists essentially of the form the pivot bearings 18. novel features of construction pointed out The roller strop members 19-and 20 are broadly and specifically in the claim for `formed of a composition of rubber andcarnovelty following a description containing borundum or other abrasive material suitan explanation in detail of an acceptable able for sharpening purposes and are mount- 60 form of the invention. l ed on the shafts 21r and 22 respectively, said The objects of the invention are to econoshafts in turn being mounted on the pivot mize in the consumption of blades in safety bearings 17 and 18 respectively, said roller razors by avoiding waste through discardstrop members meeting directly in aligning blades which have become dull; to disment/'with the recesses 14 and being always 65 criminate through the choice of a blade, as in frictional engagement. frequently one blade out of a number will Y The beds of the recesses form supports prove of better metal and superior temper for the razor blade 23 which is thus guided to another in the samelot, and consequentbetween the roller strops 19 and 20. f

20 ly be more susceptible to keeping a keener The shaft 22 terminates at one end in the 7" cutting edge; to facilitate the operation in crank handle 24 b y means of which the rollshaving those particularly with stiffer ers are driven in opposite directions to y beards, for by stropping the blade previous sharpen the cuttingl edge of the blade. to the operation, a cleaner shave is assured; The threaded .pin 25 is inserted through 25 to simplify the means often employed for the central orifice in the back plate 11, above 75 resharpening blades of theV safety razor the roller strops 19 and 20 and is lockedin type; and generally to provide an elicient the desired position by thenuts 26 and, 27 and durable device, not costly to `produce the tapered end 28 of said pin extending and therefore saleable to the consumer at a slightly beyond the beds of the recesses 14, a0 reasonable price. so that it extends over the line of meeting In the drawings, Figure 1 is a plan view of the strops 19 and 20,`consequently this of the rotary strop complete. pin serves as a centering member through Figure 2 is a front elevational view of the centrol hole in the blade. the device. VIt will be thus seen that when the cran 4igure 3 is a side elevational view of the handle is turned, the tendency is to draw the device. edge of the blade inwardly, but this is Figure 4 is a cross sectional view on the avoided bythe blade supports in the reline 4 4 in Figure 1. cesses 14, and this tendency of the blades to Figure 5 is a plan view showing a modileave those supports is prevented by the Figure 6 is a plan view showing another the rollers are drivenv they engage the cutniodification of the blade support. ting edge and sharpen the blade.

Like numerals of reference indicate cor- In Figure 5 a slight modification is shown responding parts in the various figures. in which the two pins 29 and 30 extend Referring to the drawings, the numeral from the back plate and engage the blade 10 indicates the frame, which is here shown within the holes in the razor blade on either as formed of a back plate 11, from which side of the centre hole, and in this forni of the lugs 12 and 13 eXtend forwardly at each the invention the lugs are wider apart so as end, each of said lugs having a recess 14 to let the whole length of the blade come nat the end of an inclined wall 15 from the to engagement with the roller strops.

In Figure 6 another modification shows the two claws 3l and 32 engaging the rounded edges of the razor blade and allowing the complete length of the razor blade to be engaged by the roller strops.

These claws are struck out from the walls of the frame and replace the blade supports described in the form of the invention illustrated in Figures l to 4.

The handle 33 is shown as screwed on to the threaded pin 25 beyond the back plate 11, but it is obvious that this handle may be permanently associated with the frame l0, or secured thereon in any other suitable manner. Y

The operation of the invention may be well understood from the description of the details, as no matter what the form of support may be, the blade of the razor is inserted between the roller strops, and the handle turned. The matter of the support is'merely incidental to the proper stropping of the razor and therefore three different forms of support have been illustrated and described.

The rotation of the roller strops quickly for a very few turns will produce a keen edge on the razor blade, consequently it is little or no trouble to prepare the particular blade chosen for a comfortable shave.

What I claim as my invention is In a razor blade stropper, a support comprising a base, upstanding members thereon, said members being provided with journals, opposed friction driven stropping rolls mounted therein and a driving handle therefor, a blade holder comprising an upstanding lug mounted on said base, said lug eX- tending through said base and having a threaded end adapted to receive a threaded handle member.

Signed at Montreal, Canada, this 10th day of December7 1927.

JAMES STEWART CRAIB. 

